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Electroacoustic transducer

a transducer and electroacoustic technology, applied in the field of electroacoustic transducers, can solve the problems of low productivity, low sound pressure level of the intermediate frequency band (intermediate frequency band) and the high frequency band (high frequency band), and achieve the effect of sufficient sound volume and high acoustic quality

Active Publication Date: 2018-01-11
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an omnidirectional electroacoustic transducer capable of reproducing a sound with high acoustic quality and sufficient sound volume in a wide frequency band, with a small number of components. The problem of sound pressure levels being lower in the intermediate band and high band compared to the low band is solved, and the vibration plate is driven via a linkage mechanism between the driving source and the vibration plate, resulting in a small number of components, high productivity, and low manufacturing cost.

Problems solved by technology

However, the HVT speaker has a problem that the sound pressure levels of an intermediate frequency band (intermediate band) and a high frequency band (high band) are lower than that of a low frequency band (low band).
In addition, since the vibration plate is driven via the linkage mechanism between the driving source and the vibration plate, there are problems that the number of components is very large, the productivity is low, and the manufacturing cost is high.

Method used

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Examples

Experimental program
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Effect test

example 1

[0222]According to the method illustrated in FIGS. 5A to 5E described above, the transduction film 10 of the present invention illustrated in FIG. 4 was prepared.

[0223]First, cyanoethylated PVA (CR-V manufactured by Shin-Etsu Chemical Co., Ltd.) was dissolved in dimethylfonnamide (DMF) at the following compositional ratio. Thereafter, PZT particles were added to this solution at the following compositional ratio, and were dispersed by using a propeller mixer (rotation speed 2000 rpm), and thus a coating material for forming the piezoelectric layer 12 was prepared.[0224]PZT Particles 300 parts by mass[0225]Cyanoethylated PVA 30 parts by mass[0226]DMF 70 parts by mass

[0227]In addition, the PZT particles were obtained by sintering commercially available PZT raw material powder at 1000° C. to 1200° C. and thereafter crushing and classifying the resultant so as to have an average particle diameter of 5 μm.

[0228]On the other hand, the sheet-like materials 10a and 10c were prepared in whic...

example 2

[0242]As in an electroacoustic transducer 120 illustrated in FIG. 7A, four transduction units 40 were provided, the extension directions of one side of the transduction films 10 (bent portions) in the transduction units 40 were aligned with each other, the bent portions of the transduction units 40 formed a substantially square shape in a cross section perpendicular to the one side while the bent portions were disposed to face different directions from each other, and two openings of the space enclosed by the four transduction units 40 were provided with lid members 122 having substantially the same size as the openings. Therefore, the space enclosed by the four transduction units 40 is substantially sealed.

[0243]The lid member 122 was a plate-like member made of an aluminum plate having a thickness of 6 mm.

[0244]That is, the four transduction units 40 were arranged so that from one transduction unit 40 as a reference, the radial directions of sounds from the other transduction unit...

reference example 1

[0245]As illustrated in FIG. 7B, the same as in Example 2 was applied except that the member was not included.

[0246]That is, an electroacoustic transducer 202 illustrated in FIG. 7B was configured so that four transduction units 40 were provided, the extension directions of one side of the transduction films 10 (vibration surfaces) in the transduction units 40 were aligned with each other, the vibration surfaces of the transduction units 40 formed a substantially square shape in a cross section perpendicular to the one side while the vibration surfaces face different directions from each other.

[0247]In addition, the space enclosed by the four transduction units 40 communicates with the outside on the upper and lower sides in the figure.

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Abstract

An omnidirectional electroacoustic transducer capable of reproducing a sound with high acoustic quality and sufficient sound volume in a wide frequency band is provided with a small number of components. The electroacoustic transducer includes: two or more electroacoustic transduction units each including an electroacoustic transduction film and an elastic supporter, the electroacoustic transduction film having a polymer composite piezoelectric body in which piezoelectric body particles are dispersed in a viscoelastic matrix formed of a polymer material having viscoelasticity at a normal temperature, and two thin film electrodes laminated on both surfaces of the polymer composite piezoelectric body, and the elastic supporter being disposed to be closely attached to one principal surface of the electroacoustic transduction film so as to cause the electroacoustic transduction film to be bent, in which the two or more electroacoustic transduction units are disposed so that the electroacoustic transduction films face outward and form some or all of faces of a polyhedron.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Continuation of PCT International Application No. PCT / JP2016 / 058800 filed on Mar. 18, 2016, which claims priority under 35 U.S.C. §119(a) to Japanese Patent Application No. 2015-066436 filed on Mar. 27, 2015. The above application is hereby expressly incorporated by reference, in its entirety, into the present application.BACKGROUND OF THE INVENTION1. Field of the Invention[0002]The present invention relates to an electroacoustic transducer used for an acoustic device such as a speaker.2. Description of the Related Art[0003]Sound has a “property that spreads out” and a “property that goes straight”. Sound in a low frequency band (low frequency sound) tends to spread out, and sound in a high frequency band (high frequency sound) tends to go straight. Therefore, in a case of a typical cone speaker, low frequency sound spreads around the speaker, while high frequency sound has a high sound pressure at the front surface ...

Claims

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Application Information

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IPC IPC(8): H04R1/02H04R7/24H04R1/40H04R1/26H01L41/08H04R17/00G10H3/14
CPCH04R1/02H01L41/0805H04R17/005H04R1/26H04R1/40H04R7/24G10H3/143H04R1/32G10H3/146G10H2220/535G10H2220/541H04R17/025H04R2307/025H04R2400/01H04R2499/15H10N30/886H10N30/2048H10N30/852H10N30/704
Inventor MIYOSHI, TETSU
Owner FUJIFILM CORP
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